Idaho's capital 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 known for its outdoor activities, such as skiing, hiking, and rafting. The city is also home to several universities, including Boise State University. Boise is a vibrant city with a thriving economy and a diverse population.