First and foremost, the rivers all suck at transport. Due to the terrain you have steep drops which make for impossible waterfalls and rapids. Even in the early Victorian era, movement was extremely limited.
But what about walking? Well this area combines several of the hardest features to transit:
1. Elevation change. Yes you can get over elevation in the Alps or the Himalayas ... but those have a history of well made roads dating back to Roman times (or earlier). The Andes, which historically were crossed by small armies also had Incan & later Spanish roads. There is nothing comparable in this area. Worse, building them, given the equatorial location and climate is going to be much harder.
2. Poor crops. The main traditional crop in the area is sorghum. Crop density is low or absent in the barrier areas and terrible at calorie density. Worse because sorghum is gluten free, it bakes poorly. Carrying enough sorghum just isn't feasible.
3. Irregular ground. Unlike the Sahara, getting out of the Great Lakes region is not a mostly level walk, you have routine scrambling that to this day makes road connections difficult to maintain. The calorie burden for crossing this type of land on foot is quite high.
4. Climate. The highlands (where the people are) are quite nice and hospitable. The surrounding lowlands have an average temperature higher than body temp. This increases the water burden and the calorie burden. This also means that an army on the march needs more water.
5. Water. Due to the geology of the area, a lot of the water in between is alkali. Some of this is straight up non-potable, but even more it has a nasty habit of inhibiting digestion (deactivating some digestive enzymes, increasing stomach acid production, etc.).
6. Animals. Such draft animals as were there during the era were well adapted to the highlands and terrible crossing the waste. Part of this was disease based, but even things like coat density work against armies.
Historically, exactly one full invasion occurred across the Sahara. It was, frankly, an astonishing feat of logistics done by the Moroccans on level ground with limited water needs. Pretty much only a fully mounted force with no artillery should be able to manage that crossing in this era. This is the westernmost corridor through the Sahara and the only one present when EUIV was released. The other routes were added due to fan demands and are based on very low density/high value trade routes.
Unlike all the trans-Saharan routes, getting into the Great Lakes region is not made easier by using camels or horses. The water requirements are steep (even with camels) and the terrain is much more likely to break legs; few of the period breeds have the endurance for the trip (lots of altitude change on rough terrain); those that have the endurance typically lacked the water/food efficiency. All of them would have had significant trouble in the alkali waters.
There are a very small number of invasion routes in this era that were fully land based, every where else you need to look to the river networks and this part of Africa is terrible for riverine transport to or from the coasts (much worse than the Congo).
But what about walking? Well this area combines several of the hardest features to transit:
1. Elevation change. Yes you can get over elevation in the Alps or the Himalayas ... but those have a history of well made roads dating back to Roman times (or earlier). The Andes, which historically were crossed by small armies also had Incan & later Spanish roads. There is nothing comparable in this area. Worse, building them, given the equatorial location and climate is going to be much harder.
2. Poor crops. The main traditional crop in the area is sorghum. Crop density is low or absent in the barrier areas and terrible at calorie density. Worse because sorghum is gluten free, it bakes poorly. Carrying enough sorghum just isn't feasible.
3. Irregular ground. Unlike the Sahara, getting out of the Great Lakes region is not a mostly level walk, you have routine scrambling that to this day makes road connections difficult to maintain. The calorie burden for crossing this type of land on foot is quite high.
4. Climate. The highlands (where the people are) are quite nice and hospitable. The surrounding lowlands have an average temperature higher than body temp. This increases the water burden and the calorie burden. This also means that an army on the march needs more water.
5. Water. Due to the geology of the area, a lot of the water in between is alkali. Some of this is straight up non-potable, but even more it has a nasty habit of inhibiting digestion (deactivating some digestive enzymes, increasing stomach acid production, etc.).
6. Animals. Such draft animals as were there during the era were well adapted to the highlands and terrible crossing the waste. Part of this was disease based, but even things like coat density work against armies.
Historically, exactly one full invasion occurred across the Sahara. It was, frankly, an astonishing feat of logistics done by the Moroccans on level ground with limited water needs. Pretty much only a fully mounted force with no artillery should be able to manage that crossing in this era. This is the westernmost corridor through the Sahara and the only one present when EUIV was released. The other routes were added due to fan demands and are based on very low density/high value trade routes.
Unlike all the trans-Saharan routes, getting into the Great Lakes region is not made easier by using camels or horses. The water requirements are steep (even with camels) and the terrain is much more likely to break legs; few of the period breeds have the endurance for the trip (lots of altitude change on rough terrain); those that have the endurance typically lacked the water/food efficiency. All of them would have had significant trouble in the alkali waters.
There are a very small number of invasion routes in this era that were fully land based, every where else you need to look to the river networks and this part of Africa is terrible for riverine transport to or from the coasts (much worse than the Congo).
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