The pond was probably connected to the river "Vliet" on the other side. The pond is gone now I think. The estate was pretty big. See my screenshot of Googlemaps.

I posted this with the title "Lake at Hoekenburg, Fall 1901;" however, I think it's really a small pond.

A. W. de Lathouder - September 25, 1905

Notes taken from the photo albums of John Anthony de Lathouder, grandfather of Frank Durham de Lathouder, Jr.