Kasai

• Kasai, Hyogo in Japan
• Kasai Station in the Kasai section of Edogawa, Tokyo, Japan.
• the Kasai River in Angola and the Democratic Republic of the Congo
• the Kasai River in India, also known as the Kangsabati River
• Kasai region in the Democratic Republic of the Congo, now divided into the eastern and western districts Kasai-Oriental and Kasai-Occidental, and a historic region South Kasai
• The Kasai Rex is an animal hoax
• a Korean company producing pantyhoses for women
• Air Kasai

It is also a Japanese surname:

• Noriaki Kasai, sportsman
• Kasai Zenzo, author