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Greyjoys are known to be exceptionally well accustomed to the sea fight, so Lannisters have a fleet that is ready to face them in case of attacks. When it comes to water borders, Westerlands share one with Iron Islands where House Greyjoyrules. With only one major pass through the mountains in the east of the region, the way of the armies that might march to Westerlands is easily predictable. This, however, is not a drawback, since hills and mountains make for a great natural defense of the area. Its geography is mostly marked with mountains and hills which make the area not as populated as other parts of the Westeros. It is surrounded by Riverlands on the eastern side and The Reachto the southern side. Westerlands is a seaside region of Westeros.
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There are plenty of smaller houses that swear their allegiance to the House Lannister, but more will be said of those later on. One of the major houses that play an important role in the whole story, House Lannister, rules the Westerlands. Not much happens in Westerlands in A Song of Ice and Fire, but they do have an important role in the overall story. If you are wondering why all of this is important – well, Westerlands are, believe it or not, the western part of the continent of Westeros. As you can see, sides of the world have important role when naming the continents – West for Westeros, East for Essos, and South for Sothoryos. Most of the events in A Song of Ice and Firetake place in Westeros, partly in Essos, and Sothoryos is the unexplored continent of the world in Song of Ice and Fire.
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Westeros is a continent which holds its name due to being the most western continent, as opposed to Essos and Sothoryos.
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