st ena ▁is ▁situated ▁by ▁lake ▁V ät tern , ▁Sweden ' s ▁second ▁largest ▁lake . ▁Fish ing ▁was ▁an ▁important ▁source ▁of ▁food ▁when ▁the ▁town ▁was ▁first ▁founded ▁around ▁the ▁year ▁ 1 0 0 0 ▁AD , ▁and ▁it ▁continued ▁to ▁be ▁dependent ▁on ▁fish ▁and ▁ship ▁mer ch and ise . ▁ ▁There ▁are ▁two ▁nature ▁res erves ▁in ▁the ▁municipality : ▁The ▁Om berg sl iden , ▁ 2 3 0 , 0 0 0 ▁m 2 ▁large , ▁a ▁l ime - rich ▁mar sh . ▁It ▁has ▁several ▁notable ▁plants , ▁such ▁as ▁the ▁un common ▁orch id ▁T uber ▁ge oph y te ▁( G ymn aden ia ▁od or at iss ima ), ▁and ▁the ▁car n iv orous ▁But ter wort ▁plant ▁. ▁The ▁K ast ad ▁k ulle ▁tor r äng ▁is ▁a ▁drum lin ▁rich ▁on ▁l ime , ▁and ▁hosts ▁several ▁plants ▁otherwise ▁not ▁found ▁in ▁the ▁area , ▁such ▁as ▁the ▁O xy t rop is ▁pil osa , ▁otherwise ▁very ▁sp ars ely ▁outside ▁of ▁Got land ▁. ▁ ▁S ights ▁V ad st ena ▁Castle ▁V ad st ena ▁Ab bey ▁The ▁V ad st ena ▁Hospital ▁area ▁and ▁museum ▁with ▁buildings ▁from ▁the ▁ 1 6 th ▁century ▁to ▁the ▁ 2 0 th ▁century . ▁Her rest ad ▁Church , ▁inaugur ated ▁in ▁ 1 1 1 2 , ▁which ▁makes ▁it ▁one ▁of ▁the ▁oldest ▁dated ▁stone ▁churches ▁in ▁Sweden ▁( the ▁Holy