Peninsula in America — gas found within thousand kilometre area (9)

'peninsula' is the definition.
(Kamchatka Peninsula is an example)

'america gas found within thousand kilometre area' is the wordplay.
'america' becomes 'am'.
'gas' becomes 'chat' (both can mean to talk).
'found within' indicates putting letters inside.
'thousand kilometre area' becomes 'kka' (I am not sure about this - if you are sure you should believe this answer much more).
'am'+'chat'='amchat'
'amchat' going inside 'kka' is 'KAMCHATKA'.

'in' is the link.