Isla de Chivos (Goat Island) is usually joined to Isla de Venados (Deer Island) at low tide. From the mainland, they appear as two separate islands (even at low tide), hence the two names.
For more details (including Google map image) see
here.
Equally, for more about Isla de la Piedra (Stone Island), which is not really an island at all, see
here.
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