Usquerdermaar or the Delthe or Delt is called the canal that was dug east from a watercourse from the Warffumermaar to the municipality of Usquert and split in two. The northern part consists of two branches called Usquerdermaar and Oude Delthe and forms the former headwaters. The southern part, also the former lower reaches, is called the Delthe.
The name Delthe comes from the word digging (digging), which means that the canal has an artificial dug origin.
The western branch is called Oude Delthe and flows through the mound of the Warffum Monastery. It is the old lower reaches of the Delthe. Formerly, the Oude Delthe was in direct connection with the Waddenzee via the Oostervalge tand east of farm Side management and an unnamed ditch that led to the Noorpolder. There it was continued as first the Schipsloot and then the Zeewijksterriet west of the Salome farm, to flow into the Wadden Sea a little to the west of Noordpolderzijl.
The eastern branch is called Usquerder but and flows from Usquert via Westerhorn to the landfill, where the Helderwermaar flows into the left first. From the landfill, the headwaters continue under the name Usquerdermaar (formerly New) Delthe) and records the Koksmaar further on. Further on, the Stitswerdermaar used to flow under the Usquerdermaar or Delthe to continue (since the 19th century) as the Canal through the Zuiderhorn. Since the 1970s, however, the canal has been dammed here and the headwaters have been connected to the Canal through the Zuiderhorn, which flows west to the Warffumermaar. tussen Haantil and Bieuwketil. The lower course has since been connected to the Stitswerdermaar and is the only one still referred to as Delthe. The lower course also flows into the Warffumermaar, namely at the Schaiftil (Schevetil) north of Menkeweer. Just before the mouth, the Delthe is blocked by the De Delthe pumping station, which means that traffic is no longer possible.
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