---
title: "Geographic Coherence"
type: concept
tags: [geography, worldbuilding, validation]
last_updated: 2026-04-20
---

## Definition
地理连贯性（Geographic Coherence）是指虚构世界中的地理特征（气候、地形、水文、生物群系、资源分布）符合物理规律，彼此一致，无矛盾。

## Core Principles

### 1. Rivers Don't Split
- Tributaries merge into rivers（支流汇入主流）
- Rivers don't fork into two separate rivers flowing to different oceans
- Exception: deltas, bifurcations — but these are special cases, not the norm

### 2. Climate is a System
- Rain shadows exist（雨影效应存在）
- Coastal currents affect temperature（海岸洋流影响温度）
- Latitude determines seasons（纬度决定季节）
- Don't place a tropical forest at 60°N latitude without extraordinary justification

### 3. Geography is Not Decoration
- Every mountain, river, and desert has consequences for the people who live near it
- If you put a desert there, explain how people get water

### 4. Avoid Geographic Determinism
- Geography constrains but doesn't dictate
- Similar environments produce different cultures
- Acknowledge agency

### 5. Scale Matters
- A "small kingdom" and a "vast empire" have fundamentally different geographic requirements
- Communication, supply lines, and governance scale differently

### 6. Maps are Arguments
- Every map makes choices about what to include and exclude
- Be aware of the politics of cartography

## Validation Framework

### Geographic Coherence Report
```
Region: [Area being analyzed]

Physical Geography:
- Terrain: [Landforms and their tectonic/erosional origin]
- Climate Zone: [Koppen classification, latitude, elevation effects]
- Hydrology: [River systems, watersheds, water sources]
- Biome: [Vegetation type consistent with climate and soil]
- Natural Hazards: [Earthquakes, volcanoes, floods, droughts]

Resource Distribution:
- Agricultural potential: [Soil quality, growing season, rainfall]
- Minerals/Metals: [Geologically plausible deposits]
- Timber/Fuel: [Forest coverage consistent with biome]
- Water access: [Rivers, aquifers, rainfall patterns]

Human Geography:
- Settlement logic: [Why people would live here — water, defense, trade]
- Trade routes: [Following geographic paths of least resistance]
- Strategic value: [Chokepoints, defensible positions, resource control]
- Carrying capacity: [How many people this geography can support]
```

## Related Concepts
- [[Koppen Climate Classification]]
- [[Central Place Theory]]
- [[Heartland Theory]]
- [[World-Systems Theory]]
- [[Environmental Determinism]]

## Implementation
- Used by [[Geographer]] Agent in worldbuilding
- Validates physical consistency in虚构世界构建