Karachi Samandar Pay Jaty Huy 

"Karach samandar pay jaate hue" is Urdu for "heading towards the sea in Karachi." What specific description are you looking for?
Sure, here are some hashtags you could use for a description of Karachi's coastline:
#KarachiBeachLife
#SeaSideVibes
#UrbanBeachscape
#KarachiWaves
#CoastalCharmKarachi
#SeasideSerenity
#KarachiShoreline
#BeachLifeKarachi
#SunSandSeaKarachi
#MaritimeMagicKarachi