Tsibirin Richardson tsohon tsibiri ne a San Francisco Bay, a arewacin California . Yayin da ruwa da marsh suka kewaye shi (kuma ya bayyana a matsayin tsibiri a cikin taswirar da aka bincika a cikin shekara ta 1894), haɓaka yankunan da ke kewaye ya sa ƙasa ta kewaye shi gaba ɗaya a tsakiyar ƙarni na 20. Tana cikin gundumar Marin, a cikin garin Corte Madera . Matsayin sa shine  , kuma Amurka Sashen Binciken (USGS) ya ba ta tadawa kamar 16 Fata (4.9 m) a shekara ta 1981. Yana kusa da ƙarshen Corte Madera Creek, inda yake kwarara zuwa San Francisco Bay. A cikin shekara ta 1885, ta sami mallakar Corte Madera Rancho del Presidio, ɗayan manyan wuraren kiwo a cikin gundumar Marin a lokacin. Amurka ta kai karar masu mallakarta a cikin shekara ta 1891, suna zargin sun sayi tsibirin (tsakanin kusan 4,000 acres (1,600 ha) na ƙasa a yankin) ta hanyar "makircin ƙarya da zamba, ana zargin cewa bayanan filin ne na ainihin binciken".