First Sister Island
| Language of origin | English language |
| Feature Type: | Island - Land area surrounded by water or marsh. |
| Status: | Official |
| Name Authority: | BC Geographical Names Office |
| Relative Location: | One of the Chain Islands, Ganges Harbour, Saltspring Island, Cowichan Land District |
| Latitude-Longitude: | 48°50'29"N, 123°27'40"W at the approximate centre of this feature. |
| Datum: | WGS84 |
| NTS Map: | 92B/14 |
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Origin Notes and History:
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Adopted 7 September 1950 on C.3450; a long-established local name according to Hydrographic Service (together with Second Sister Island and Third Sister Island, the 3 outermost islands of the Chain Islands group) Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office |
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This island may also be/have been known as "Castle Island" according to unattributed note on BC name card. Source: BC place name cards, correspondence and/or research by BC Chief Geographer & Geographical Names Office staff. |