Treppoja joastik
koordinaadid: 59° 21′ 0″ N, 24° 15′ 56″ E

Treppoja joastik asub Harju maakonnas Lääne-Harju vallas Tallinna–Rannamõisa–Kloogaranna tee ääres.
Treppoja saab alguse Illurma klindineemikult ning Treppoja joastik asub kohal, kus oja laskub nõlva pidi Lahepere klindilahte. Seal on oja 5–15 m laiune ja sel on kuus 0,3–1,5 m astangut. Kokku on joastiku kogukõrgus 5,5 meetrit.
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 treppoja-joastik-17
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 treppoja-joastik-19
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 treppoja-joastik-21
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Boriss Melikjan
treppoja-joastik-15
Camera: SONY ILCE-7M3 | Date: 8/3/24, 5:01 PM | ISO: 1600 | Exposure: 1/100s | Aperture: ƒ/16.0 | Focal Length: 50mm | Focal Length (35mm): 50mm | Flash: Flash did not fire | File Name: treppoja-joastik-15.jpg
treppoja-joastik-17
Camera: SONY ILCE-7M3 | Date: 8/3/24, 5:01 PM | ISO: 1600 | Exposure: 1/100s | Aperture: ƒ/16.0 | Focal Length: 50mm | Focal Length (35mm): 50mm | Flash: Flash did not fire | File Name: treppoja-joastik-17.jpg
treppoja-joastik-19
Camera: SONY ILCE-7M3 | Date: 8/3/24, 5:01 PM | ISO: 1600 | Exposure: 1/100s | Aperture: ƒ/16.0 | Focal Length: 50mm | Focal Length (35mm): 50mm | Flash: Flash did not fire | File Name: treppoja-joastik-19.jpg
treppoja-joastik-21
Camera: SONY ILCE-7M3 | Date: 8/3/24, 5:01 PM | ISO: 1600 | Exposure: 1/100s | Aperture: ƒ/16.0 | Focal Length: 50mm | Focal Length (35mm): 50mm | Flash: Flash did not fire | File Name: treppoja-joastik-21.jpg