This is actually, I think, three trees that have fused together. Their trunks (like all these t's?) have merged together and make for a quite impressive tree-in-one. On the left of these trees about 50 meters away and several meters below is the Sava River. The embankment where the passer-by is walking is a sort of dyke to prevent flooding of residences behind it. However, a couple of years ago after major rains, the Sava (and Danube too, of course) overflowed, and here the water reached half-way up the embankment.