Hamakita-ku (浜北区) was a ward in Hamamatsu, Shizuoka Prefecture, Japan. It is bordered by Tenryū-ku, Higashi-ku, Naka-ku and the city of Iwata. The Tenryū River and the Akaishi Mountains form natural boundaries for the ward.

Tenryū-ku (天竜区) is one of the three wards of the city of Hamamatsu, Shizuoka Prefecture, Japan. It is bordered by Kita-ku and Hamakita-ku in Hamamatsu, the cities of Shimada and Iwata and towns of Mori and Kawanehon in Shizuoka, Shishiro, Tōei and Toyone in Aichi Prefecture and Iida and Tenryū in Nagano Prefecture.