Hello and sorry for my bad english.
Is there way to create repeater to cover larger areas or overcome the mountains?
That is what each node does as it forms the mesh.
@Damianuscz, Welcome! Repeater specific discussion can be found here: Headless Base Station / Repeater
As @GaryMortimer mentioned, each node will extend your Meshtastic mesh automatically - just pick one node, leave it powered on top of the hill, and enjoy! 
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Though in the queue is to add a “repeater mode” checkbox, which will optimize the sleep behavior for what you need for that sort of deployment. Also we should preferentially route using such nodes.
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This may be a dumb question but… if a “repeater” is on a different “channel” than your own unit, would it still relay the traffic. I understand that you need to be on all the same channel to communicate and to show up on the map. My thinking is that you would have a bunch of nodes set to the default channel setup around the city, then you and your party would be a on private channel to see each other but still relay your messages through the rest of mesh.
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I have this same question.
This is coming in the new versions of meshtastic currently in very early alpha
Welcome to the community @javanaut.
As OI_Dave said that feature is currently under active development and testing.
To clarify, what Meshtastic considers a channel is a combination of settings, encryption key, and an actual radio frequency range. Multi channel support will require a few things that define a channel be the same, most importantly the frequency parts.
Thank you @Spor7biker. Does that mean the current repeater functionality requires all devices be on the same channel?
Yes, all devices must be on the same channel with current non testing/older firmware.