Hallo Frank,
the place is called Merum in Limburg.
They married 23-05-1787 in Neer, Limburg. See
www.aezel.eu for DTB in Limburg prior to 1811.
The wedding certificates records that Jan Baptist Clephas is born in Leende for some reason, but when searching in aezel I find that he indeed is born in Merum, baptized in Herten (02-12-1763) and indeed a son of the parents as recorded in the death certificate. Furthermore, it is recorded at the wedding certificate that Wilhelmina Theelen is the doughter of Petrus Thelen and Anna Maria Mooren, and thus she is baptized in Neer (23-12-1764).