Image of modern-day Surabaya, Indonesia. While Surabaya today is a highly sophisticated port operation, Kalimas, now off to the side of the modern port, still maintains a modest inter-island operation of traditional commerce.  Photo credit bennylin.

The Port of Surabaya, early twentieth century, at the mouth of the Kalimas inlet.  Handinoto's collection, the resource(s) is/are maintained by Petra Christian University, Surabaya. Photo credit.

There are other images of Surabaya available on the Petra Christian University Library search page.