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The Central Koseman Rift Valley is a rift valley in the middle of the Koseman continent. Form from diverging tectonic plates. Millions of years in the future, a new inland sea will form between West Koseman and East Koseman as these landmasses separate further.

You can't just decide that there is a rift valley somewhere.

Yes, a rift valley is too large and geologically significant. A small slot canyon (perhaps modeled after Antelope Canyon the U.S.) or a cenote may be more suitable as sunlit smaller-scale dips in altitude in the broader landscape. You'll have to discard this.

@HethrJarrod I unfortunately have to reject this, as the image is both broken and it's too extreme of a landmark.