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Gotland

Eastern Europe · Isolated Landmass

Gotland

Sweden

Gotland is strongest on Sustainability 9/10 — A functioning island society of more than 61,000 people with housing, settlements, farms, municipal water and mature public infrastructure provides exceptional existing habitat for twenty survivors. Current water stress and off-island technical dependencies prevent the highest class.. Its clearest scored constraint is Defensibility 1/10 — The canonical Base is an entire large inhabited island with a long coastline, multiple settlements, ports and roads. Twenty people can secure chosen buildings but cannot create a meaningful continuous island perimeter; sea separation is not double-counted as direct defence..

Overall

4.7

Defensibility

1

Isolation

4

Sustainability

9

Ranking context

How this base ranks

Global

#50 of 91 · Top 54.95%

Region · Eastern Europe

#7 of 10 · Top 70%

Base Type · Isolated Landmass

#8 of 19 · Top 42.11%

Field assessment

At a glance

Bottom Line

For the fixed 20-person Base boundary, the most important endurance constraint is Maintenance Resilience 5/10 — Ordinary housing, farms and much food production remain useful with relatively modest technology, but municipal water requires managed production and 2026 evidence shows tight source margins. Electricity is materially dependent on vulnerable mainland connections and maintained grid infrastructure, producing a mixed resilience profile rather than strong technical independence..

Biggest Trade-off

The central trade-off is the catalogue's strongest evidenced dimension, Sustainability at 9/10, against its weakest evidenced dimension, Defensibility at 1/10.

Most Likely Failure

The clearest evidenced failure pressure is Maintenance Resilience: Ordinary housing, farms and much food production remain useful with relatively modest technology, but municipal water requires managed production and 2026 evidence shows tight source margins. Electricity is materially dependent on vulnerable mainland connections and maintained grid infrastructure, producing a mixed resilience profile rather than strong technical independence.

Score rationale

Why it scores this way

Defensibility · 1/10

The canonical Base is an entire large inhabited island with a long coastline, multiple settlements, ports and roads. Twenty people can secure chosen buildings but cannot create a meaningful continuous island perimeter; sea separation is not double-counted as direct defence.

Advantages

  • Positive credit is limited to what supports the Defensibility score of 1/10; the component rationale is: The canonical Base is an entire large inhabited island with a long coastline, multiple settlements, ports and roads. Twenty people can secure chosen buildings but cannot create a meaningful continuous island perimeter; sea separation is not double-counted as direct defence.

Limitations

  • Do not infer additional Defensibility capability outside the fixed Base boundary or beyond the recorded evidence.

Isolation · 4/10

The Baltic provides substantial mainland separation, but Gotland itself contains more than 61,000 residents including a roughly 26,000-person urban centre, plus normal ferry and air connectivity. Major population pressure is therefore already present on the island even though mainland movement is slowed by water.

Advantages

  • Positive credit is limited to what supports the Isolation score of 4/10; the component rationale is: The Baltic provides substantial mainland separation, but Gotland itself contains more than 61,000 residents including a roughly 26,000-person urban centre, plus normal ferry and air connectivity. Major population pressure is therefore already present on the island even though mainland movement is slowed by water.

Limitations

  • Do not infer additional Isolation capability outside the fixed Base boundary or beyond the recorded evidence.

Sustainability · 9/10

A functioning island society of more than 61,000 people with housing, settlements, farms, municipal water and mature public infrastructure provides exceptional existing habitat for twenty survivors. Current water stress and off-island technical dependencies prevent the highest class.

Advantages

  • Positive credit is limited to what supports the Sustainability score of 9/10; the component rationale is: A functioning island society of more than 61,000 people with housing, settlements, farms, municipal water and mature public infrastructure provides exceptional existing habitat for twenty survivors. Current water stress and off-island technical dependencies prevent the highest class.

Limitations

  • Do not infer additional Sustainability capability outside the fixed Base boundary or beyond the recorded evidence.

Survival horizons

How survival changes over time

First 7 days: current defence/contact profile

First 7 Days

This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.

Positive factors

  • The stronger current condition in this horizon is Exposure Control 3/10 — The Baltic prevents ordinary mainland walkers from approaching overland, but that advantage is heavily offset by the island's own substantial population, long coastline, numerous settlements, roads and port/air access. Twenty survivors cannot monitor the canonical whole island as a small set of approach funnels..

Risks

  • The weaker current condition in this horizon is Defensibility 1/10 — The canonical Base is an entire large inhabited island with a long coastline, multiple settlements, ports and roads. Twenty people can secure chosen buildings but cannot create a meaningful continuous island perimeter; sea separation is not double-counted as direct defence.; no better future state is assumed.

First 100 days: current habitat/capacity profile

First 100 Days

This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.

Positive factors

  • The stronger current condition in this horizon is Sustainability 9/10 — A functioning island society of more than 61,000 people with housing, settlements, farms, municipal water and mature public infrastructure provides exceptional existing habitat for twenty survivors. Current water stress and off-island technical dependencies prevent the highest class..

Risks

  • The weaker current condition in this horizon is Sustainability 9/10 — A functioning island society of more than 61,000 people with housing, settlements, farms, municipal water and mature public infrastructure provides exceptional existing habitat for twenty survivors. Current water stress and off-island technical dependencies prevent the highest class.; no better future state is assumed.

Long term: current resource/maintenance profile

Long Term

This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.

Positive factors

  • The stronger current condition in this horizon is Resource Security 7/10 — Gotland combines exceptionally extensive agricultural land and material food production with operating potable-water systems and substantial island infrastructure. Current water scarcity and mainland-dependent electricity/technical supply are important vulnerabilities, but the island's food-producing capacity and distributed land/resources provide strong durable advantages for a twenty-person group..

Risks

  • The weaker current condition in this horizon is Maintenance Resilience 5/10 — Ordinary housing, farms and much food production remain useful with relatively modest technology, but municipal water requires managed production and 2026 evidence shows tight source margins. Electricity is materially dependent on vulnerable mainland connections and maintained grid infrastructure, producing a mixed resilience profile rather than strong technical independence.; no better future state is assumed.

Tactical assessment

Practical Reality

Reality Check

Scores apply only to the defined Base and exactly 20 capable adults. Unknown, excluded or external assets are not credited as hidden capability.

Best Use

Within the evaluated boundary, treat Sustainability as the primary operational strength; do not promote that score into capabilities the evidence does not establish.

Key Risk

Maintenance Resilience is the key evidenced long-duration risk: Ordinary housing, farms and much food production remain useful with relatively modest technology, but municipal water requires managed production and 2026 evidence shows tight source margins. Electricity is materially dependent on vulnerable mainland connections and maintained grid infrastructure, producing a mixed resilience profile rather than strong technical independence.

Strengths

  • One of the strongest scored dimensions is Sustainability 9/10 — A functioning island society of more than 61,000 people with housing, settlements, farms, municipal water and mature public infrastructure provides exceptional existing habitat for twenty survivors. Current water stress and off-island technical dependencies prevent the highest class..
  • One of the strongest scored dimensions is Population Capacity 9/10 — An island currently supporting more than 61,000 residents has overwhelming housing, sanitation, workspace, storage and community-infrastructure headroom relative to twenty people, even allowing for uneven distribution and degraded services after disruption..
  • One of the strongest scored dimensions is Resource Security 7/10 — Gotland combines exceptionally extensive agricultural land and material food production with operating potable-water systems and substantial island infrastructure. Current water scarcity and mainland-dependent electricity/technical supply are important vulnerabilities, but the island's food-producing capacity and distributed land/resources provide strong durable advantages for a twenty-person group..

Weaknesses

  • One of the weakest scored dimensions is Defensibility 1/10 — The canonical Base is an entire large inhabited island with a long coastline, multiple settlements, ports and roads. Twenty people can secure chosen buildings but cannot create a meaningful continuous island perimeter; sea separation is not double-counted as direct defence..
  • One of the weakest scored dimensions is Exposure Control 3/10 — The Baltic prevents ordinary mainland walkers from approaching overland, but that advantage is heavily offset by the island's own substantial population, long coastline, numerous settlements, roads and port/air access. Twenty survivors cannot monitor the canonical whole island as a small set of approach funnels..
  • One of the weakest scored dimensions is Isolation 4/10 — The Baltic provides substantial mainland separation, but Gotland itself contains more than 61,000 residents including a roughly 26,000-person urban centre, plus normal ferry and air connectivity. Major population pressure is therefore already present on the island even though mainland movement is slowed by water..

Assumptions / constraints

  • Only assets inside the recorded Core Base and immediate operating boundary are credited; excluded surroundings and unproven future access remain outside the score.

Decision context

Rivals / Alternatives

Similar rival

Faroe Islands

Faroe Islands · Isolated Landmass

Faroe Islands keeps the same isolated landmass strategy, with only 0.3 points between the overall scores and closely matched isolation pressure.

Overall 5/10

Strongest alternative

Heligoland

Germany · Isolated Landmass

Heligoland scores 6.3 overall versus 4.7, adding a stronger isolation profile while staying relevant as another isolated landmass.

Overall 6.3/10

Wildcard rival

Fort Jefferson

United States · Fortified Structure

Fort Jefferson changes the strategy: it is a fortified structure with a defensibility edge, while Gotland holds more of the sustainability advantage.

Overall 6.7/10

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