The Ocean Biogeographic Information System (OBIS) is a global open-access data portal containing information on the distribution and abundance of marine species collected by a network of regional nodes. OBIS works with various other initiatives to build synergies and fill gaps in knowledge about marine organisms and ecosystems. It provides data and tools to help identify ecologically important areas and understand how climate change may impact species distributions and behaviors. OBIS aims to integrate all available biogeographic data from around the world and make it freely accessible online.