Geography and geology Archipelago Sea

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the inner archipelago wooded. picture taken in autumn, when reeds surrounding islands have turned brown.


the archipelago sea covers triangular area cities of mariehamn (60°5′52″n 19°56′23″e / 60.09778°n 19.93972°e / 60.09778; 19.93972), uusikaupunki (60°48′4″n 21°24′50″e / 60.80111°n 21.41389°e / 60.80111; 21.41389), , hanko (59°50′0″n 22°58′15″e / 59.83333°n 22.97083°e / 59.83333; 22.97083), @ corners. archipelago can divided inner , outer archipelagos, outer archipelago consisting of smaller, uninhabited islands. total surface area 8,300 square kilometres (3,205 square miles), of 2,000 square kilometres (772 square miles) land.


the archipelago has large number of islands. exact number depends on definition of term island , size of patches of dry land in area varies small rocks peeking out of water large islands several villages or small towns. number of larger islands of on 1 km within archipelago sea (in provinces of Åland isles , southwest finland) 257, whilst number of smaller isles of on 0.5 ha 17,700. if number of smallest uninhabitable rocks , skerries accounted, 50,000 estimate. in comparison, number of islands in canadian arctic archipelago 36,563. indonesia has 17,508 islands, according indonesian naval hydro-oceanographic office. philippines have 7,107 islands.


the islands began emerging sea shortly after last ice age. due post-glacial rebound process still going on, new skerries , islands being created , old ones enlarged or merged. current rate of rebound between 4 , 10 millimetres year. because islands made of granite , gneiss, 2 hard types of rock, erosion slower rebound. however, due southern location, effect of postglacial rebound smaller example in kvarken (finnish: merenkurkku) further north.


the sea area shallow, mean depth of 23 m. of channels not navigable large ships.


there 3 crater-like formations in archipelago. 1 of them, lumparn in Åland, genuine impact crater. (60°8′22″n 20°7′37″e / 60.13944°n 20.12694°e / 60.13944; 20.12694) 2 other formations intrusions. more prominent of these Åva intrusion in municipality of brändö, notable in satellite photos , high-resolution maps. (60°28′19″n 21°1′0″e / 60.47194°n 21.01667°e / 60.47194; 21.01667) other similar formation in fjälskär, between main islands of houtskär , iniö. (60°18′25″n 21°22′18″e / 60.30694°n 21.37167°e / 60.30694; 21.37167)








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