In the eastern area springing iron springs on a mountainside. The water coming to light here contains a high proportion of iron hydroxides. The water has a temperature of about nine degrees, which indicates a near-surface origin. There is also a spring in the western part of the park in Rombergsiepen. The natural Siepen receives strong inflow, also ferrous, by outcropping mine water of the bonanza Glückaufsegen. Since the mine water comes from deeper layers, the temperature is between 13 ° C and 15 ° C all year round. The springs flow to the Schondelle, which flows through the Rombergpark from south to north. Already with the arrival of the park, a part of the water of the Schondelle is conducted parallel via a separate run, the Wiesenbach, and feeds the castle pond of the former Brünninghausen house in the northern part of the park. North of the castle pond, the Pferdebach flows from the east into the Schondelle. The Schlossteich (Big Pond) has an island and bar-like viewing platforms with benches in the water. Here you can see waterfowl, big fish and even turtles.