The capital of Idaho is Boise, which is a five-letter word. Boise is the largest city in Idaho and the state capital. It is located on the Boise River in southwestern Idaho and is the most populous city in the state. Boise is home to many cultural attractions, including the Idaho State Capitol, the Boise Art Museum, and the Basque Museum and Cultural Center. The city is also known for its outdoor recreation opportunities, such as skiing, hiking, and rafting.