So where is this Bitcoin ledger which can be used and seen by anyone?
It lives on many thousands of ‘nodes’ – typically dedicated and inexpensive computers – which together form the Bitcoin network. Each node contains a copy of the Bitcoin ledger.
Anyone can run a node, and no permission is needed. Nodes can join or leave the network at any time without restriction. You don't need to run a node to use Bitcoin, and you don't need to use Bitcoin to run a node.
As there are nodes in most countries, Bitcoin is everywhere. But because the ledger has no specific location, Bitcoin is nowhere.
Bitcoin is everywhere and nowhere.