okean

/okean/

Cases

SingularPluralWhen to use it
nominativeokeanthe oceanokeanlathe oceansthe plain dictionary form — the doer of the sentence
genitiveokeannıthe ocean'sokeanlanıthe oceans'the owner — whose it is
accusativeokeannıthe ocean (as the object)okeanlanıthe oceans (as the object)a specific, known object — whom or what
dativeokeangato the oceanokeanlağato the oceansdirection or recipient — to where, to whom
locativeokeandaat / in the oceanokeanladaat / in the oceanswhere it is; also having — mende bar, "I have it"
ablativeokeandanfrom the oceanokeanladanfrom the oceanswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
myokeanımmy oceanokeanlarımmy oceans
yourokeanıngyour oceanokeanlarıngyour oceans
his / herokeanıhis / her oceanokeanlarıhis / her oceans
ourokeanıbızour oceanokeanlarıbızour oceans
you all'sokeanığızyou all's oceanokeanlarığızyou all's oceans
theirokeanlarıtheir oceanokeanlarıtheir oceans

The overlap in the last rows is real, not a mistake: okeanları can mean "his / her oceans", "their ocean", or "their oceans" — context decides.