A boat accident on the Niger River in southern Nigeria has killed at least 26 people, authorities in Kogi State said on Wednesday. Last month, a crowded ferry boat capsized in Niger State after reportedly hitting a tree stump, drowning at least 32 people. Kogi State is particularly vulnerable to flooding during the rainy season, which generally lasts from March to November in the region. A few hundred kilometres (miles) upstream from the site of the accident, in Lokoja, the Niger River -- the third longest in Africa -- is joined by its main tributary Benue River. They included the Ibaji area, where the traders had departed from in the latest boat accident, and which is the region's rice producing hub.