This suggestion is what it says on the tin.

When you stake your claim on a piece of land and declare it a country, what kind of landscape are you building off of? Is it in the arctic? How about along the coast? Surely, wherever your country is located, the lay of the land itself could provide benefits and detriments to your empire's growth.

The purpose of this suggestion is to promote an added layer of strategy to country builds, as well as open the door for new strategies to flourish.

When creating your country, you will also be asked if your land is located on any dominant terrain. You can choose not to do this, and be provided with no additional benefits or drawbacks. However, once you have made your choice, it can not be changed, even if you die and restart.

The bonuses and drawbacks would stack with those provided by your chosen government type.

I've provided a few examples. Feedback would be appreciated.

Tundra
-75% Food Production
-25% Population
-40% Bushel Decay
+10 % Oil Production
+30% Defense against Spies
+50% Defense against Troops

Desert
More frequent Droughts
-20% Per Capita Income
10% Tech Per Turn
+20% Turret Defense
+20% Construction Speed
- 25% Time for Goods to arrive on Market

Plains
-15% Defense
-25% Industrial Production
More frequent Food Booms
+20% Agricultural Tech Effectiveness
-50% Effectiveness of Harmful Spy ops made against you.
No Earthquakes

Coastline
-25% Exploration Rate
-20% Defense against spies
More Frequent PCI Booms
+10% Per Capita Income
-20% Corruption
-6 hours Foreign Aid Cooldown

Mountains
Susceptible to Landslides (Destroys Buildings and kills civs)
+20% Bushel Decay and Corruption
+10% Military Defense
-30% Attack Gains on Standard and Planned strikes against you.
-6 hours Planned Strike brigade cooldown
+10% Research Ally Gains

Wetlands
+10% Private Market Costs
-15% Maximum Technology
+20% Spy Production
-10% Food Consumption
More frequent Oil Booms
+10% Missile Hit Chance