Mosquera is considered to have been formed in a similar way to that of North Seymour and Baltra Island by way of an uplift.

The island is approximately 2 million years old and consists of a thin elongated stretch of white sand, tide pools and rocks. 

The majority of Mosquera is covered with sand and barren lava rock.  In terms of vegetation on the island, there is very little, although Sesuvium portulacastrum (sea purslane), a sprawling perennial herb grows in the sand.

The Beagle - Mary Anne - Cachalote - Sagitta - Amazonia - Samba - Beluga - Galaxy - Princess Grace - Aida Maria - Eden - Evolution - Eclipse - Grand Odyssey - Journey I - Eric - Flamingo - Letty - Odyssey - Athala - Nemo I - Nemo II - Diamante - Alta - Lammer Law - Rachel - La Pinta  - Humboldt Explorer - Parranda - Isabela (Albemarie) - Santa Cruz (Indefatigable) - San Cristobal (Chatham) - Baltra (South Seymour) - North Seymour (Seymour Norte) - Fernandina (Narborough) - Española (Hood) - Genovesa (Tower) - Bartolomé (Bartolemew) - Santiago (San Salvador or James) - Santa María (Floreana or Charles) - Marchena (Blindoe) - Mosquera - Plaza Sur (South Plaza) - Pinta (Abingdon) - Pinzón (Duncan) - Santa Fé (Barrington) - Rabida (Jervis) - Daphne

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