Oceanography, the study of the ocean, is important to society for many reasons. For instance, the ocean stores and transports large amounts of heat and carbon and is therefore a critical component of Earth's climate system. Weather forecasting, fishing, shipping, mining and drilling, search-and-rescue operations, tourism, national security, and other human activities also benefit from a knowledge of oceanography. Oceanography is an inherently global science, yet the number of ocean scientists from some regions such as Africa, the Caribbean, and others, is very small in proportion to their share of the global population. We believe that ocean science will benefit greatly from sustained collaborations between US scientists and scientists elsewhere around the world. With these motivations in mind, we have been running The Coastal Ocean Environment Summer School In Nigeria and Ghana (COESSING; https://coessing.org) for one week every summer since 2015. Over time, the school has advanced from a small in-person event to a much larger hybrid in-person/online event. In 2022, we conducted the school in Nigeria, Africa's most populous country, for the first time. We will discuss the history, curriculum, participants, and outcomes of the school, and our vision for expanding the summer school concept to many more countries around the world.