|Japan Rivers and Named Features|
You will want to sort out the Feature Type Designations (see field descriptions).
We are also posting the DCW Japan Rivers dataset for downloading here in ESRI coverage format.
Japan Historical GIS
Japan Datasets and Search Engine
'Digital Chart of the World'
Japan Drainage Network, ca 1995
(note: DCW has been superceded by VMAP0 and VMAP1, the main DCW download link at PSU appears to be dead)
GEOnet Names Server, Name Files of Japan, ca 2003.
'GNS Feature Designation Cross-Reference'