It's Dersu Uzala, with Kagemusha as a close second. No complaints about Sanjuro being in the top five, however :-)
P.S. His strangest movie was Dodeskaden, with Ikiru a close second. And I love watching his early postwar crime movies, it's like watching a triple-A pitcher you know is going to smoke the majors someday.
Kagemusha is on Netflix.
Dersu Uzala is one of the worst looking films ever made by a great film maker. They used this horrible Soviet film stock. The minuscule title character probably inspired Yoda.