Soco will leave in about a month, after completing a seismic survey of the park's Lake Edward, where drilling was to have commenced. Tens of thousands of local people depend on the lake for fish, and it is also home to thousands of hippopotamuses. Soco has vowed not to drill in the park without permission from UNESCO, and to keep out of all the world's 981 World Heritage Sites.
The firm was under pressure after an expert report last month on the status of the park. French company Total pulled out last year.