The River Mentagnus starts in the highlands of Falahn, flowing north through Boondoxia into the Valaxian/Boondoxian Channel. In Falahn, the area around the Mentagnus is mountainous and rugged, so there is little habitation. Down in Boondoxia, however, the heavy industry of the region has surrounded the river, with factories and docks lining the banks. This has caused serious problems, though, as the waste from the industry heedlessly pumped into the Mentagnus has left it heavily polluted, virtually wiping out the wildlife, and making it very uncomfortable for the people living and working nearby.

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Natural features of Ostentia