The Apollonia quadrangle (H-5) runs from 360 to 270° longitude and 20 to 70° latitude on Mercury. It was not illuminated when Mariner 10 made its three flybys of the planet and so wasn't mapped in detail until MESSENGER few by the planet in 2008. It is named after the Apollonia albedo feature.
| Quadrangles on Mercury | |||||||
|---|---|---|---|---|---|---|---|
| H-1 Borealis (features) |
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| H-5 Apollonia (features) |
H-4 Liguria (features) |
H-3 Shakespeare (features) |
H-2 Victoria (features) |
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| H-10 Pieria (features) |
H-9 Solitudo Criophori (features) |
H-8 Tolstoj (features) |
H-7 Beethoven (features) |
H-6 Kuiper (features) |
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| H-14 Cyllene (features) |
H-13 Solitudo Persephones (features) |
H-12 Michelangelo (features) |
H-11 Discovery (features) |
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| H-15 Bach (features) |
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