Alhough being in the Tanba Province area, Nantan is closely related to Kyoto and Osaka, and, when Osaka District Meteorological Observatory and Kyoto Local Meteorological Observatory use the term of "the south part of Kyoto Prefecture," it refers to the area which includes both Yamashiro Province and Nantan.
丹波国域でありながら京都や大阪との結びつきが強く、大阪管区気象台・京都地方気象台では山城国＋南丹で京都府南部とされる。