. ▁ ▁Lake ▁Mah op ac ▁ ▁The ▁ham let ▁of ▁Mah op ac ▁enc ir cles ▁pictures que ▁ ▁Lake ▁Mah op ac . ▁ ▁It ▁contains ▁three ▁islands , ▁Fair y , ▁Pet re , ▁and ▁Can opus , ▁all ▁priv ately ▁owned . ▁ ▁Fair y ▁Island ▁sports ▁multiple ▁homes ▁accessible ▁via ▁a ▁short ▁cause way ; ▁Pet ra ▁bo asts ▁the ▁Mass aro ▁House , ▁a ▁Frank ▁Lloyd ▁Wright - in sp ired ▁residence , ▁and ▁a ▁Wright - des igned ▁b ung alo , ▁the ▁A . ▁K . ▁Ch ahr oud i ▁C ott age ; ▁Can opus ▁is ▁und e velop ed . ▁ ▁Bo ating , ▁fish ing ▁and ▁other ▁water ▁sports ▁are ▁permitted ▁on ▁the ▁lake . ▁ ▁S li ps ▁and ▁support ▁services ▁are ▁provided ▁by ▁two ▁mar inas . ▁ ▁Besides ▁Lake ▁Mah op ac , ▁other ▁la kes ▁within ▁the ▁Mah op ac ▁CD P ▁include ▁Kirk ▁Lake , ▁Lake ▁C asse , ▁Lake ▁Sec or , ▁Te ak ett le ▁Sp out ▁Lake , ▁and ▁Long ▁P ond . ▁ ▁Lake ▁Mah op ac ▁is ▁within ▁the ▁Cro ton ▁River ▁waters hed ▁yet ▁not ▁a ▁part ▁of ▁the ▁New ▁York ▁City ▁water ▁supply ▁system ' s ▁Cro ton ▁W aters hed . ▁ ▁Kirk ▁Lake , ▁a ▁controlled ▁lake ▁in ▁that ▁system , ▁is ▁both . ▁ ▁Mah op ac ▁F alls ▁ ▁In ▁colonial ▁times ▁a ▁large ▁gr ist mill ▁sat ▁near ▁the ▁present - day ▁intersection ▁of ▁Route