A seaport is a major facility in a city, for the loading, unloading, and movement of cargo; to and from from oceanicships. The term also refers to a city with such a facility. (See also: port)
... would be "I pervade all this universe...".
"mat-sthaani" in the second line is a compound
of "mat" (me) and "stha" (standing, staying at) and
means "they are ...