At many places in the Pold­ers, in the Oder fore­land but also beyond the Hohen­saat­en-Friedrich­sthaler Wasser­straße there are oxbow lakes of the Oder, which has been reg­u­lat­ed for 100 years. The Oder Riv­er, which once mean­dered freely through the low­er Oder val­ley, was brought togeth­er at the east­ern edge of the val­ley at the begin­ning of the 20th cen­tu­ry, the loops and loops of the riv­er sep­a­rat­ed by sum­mer dykes and degrad­ed to oxbow lakes and oxbow lakes. Dur­ing the win­ter months, the Wet pold­ers (Criewen­er and Schwedter Pold­er and Fid­di­chow­er Pold­er) these oxbow lakes and oxbow lakes are flood­ed, and the water can exchange. With the drainage of the water in the spring and unfor­tu­nate­ly also with the arti­fi­cial pump­ing out of the water that does not drain away by itself, the oxbow lakes become bod­ies of water again with­out con­nec­tion to the neigh­bor­ing rivers after the inlet and out­let struc­tures are closed.

In the Dry pold­er (Lunow-Stolper Trock­en­pold­er, Friedrich­sthaler Pold­er) these win­ter floods do not exist and there­fore no con­tact of the oxbow lakes and oxbow lakes with the Oder riv­er water. Fresh water comes into the oxbow lakes only through seep­age water through the dike feet or through rain­wa­ter. Inci­den­tal­ly, this leads to dif­fer­ent aquat­ic fau­na, espe­cial­ly fish fau­na, in the oxbow lakes of the dry and flood­ed pold­ers, which sci­en­tists are con­tin­u­ous­ly investigating.

At the edge of these waters, the high inflo­res­cences of the marsh milk­weed fall as ear­ly as the end of April (Euphor­bia palus­tris) with their intense­ly yel­low col­ored bracts. In mid-May, the white flower spots of the water crow­foot (Ranun­cu­lus aquatilis) adorn the scour (nat­ur­al depres­sion of the water­course), soon accom­pa­nied by the very incon­spic­u­ous inflo­res­cences of the spawn­ing weeds grow­ing sub­merged in the water. In ear­ly sum­mer, the pink-red inflo­res­cences of the mag­nif­i­cent swan flower are on the edges of the water (Buto­mus umbel­la­tus) to admire. Some pools are in the sum­mer with dense stocks of the white water lily (Nymphaea alba) cov­ered, occa­sion­al­ly by the yel­low flow­ers of the pond rose (Nuphar lutea) inter­spersed. The yel­low flower groups of the mead­ow alant pro­vide a col­or­ful pic­ture (Inu­la bri­tan­ni­ca), the blue flower spikes of the long-leaved blue looses­trife (Pseudolysi­ma­chion longi­foli­um) who have favour­it­ed cat’s tail tiny pink flow­ers (Leonu­rus mar­ru­bi­as­trum) and the white inflo­res­cences of the wil­low-leaf yarrow (Achil­lea sali­ci­fo­lia) mixed with lots of grass­es and sedges.