The Blüemlisalp forms a ridge of great height , cut away in precipices on the southeast side , surmounted by four principal peaks , in the following order , reckoning from east to west : Morgenhorn ( 3,623 m ) , Wyssi Frau ( 3,648 m ) , the Blüemlisalphorn ( 3,661 m ) and the Oeschinenhorn ( 3,486 m ) .