Engine oil leak

Hello,

Last week, I renew engine oil and found that I have a leak close to the oil filter.
This leak is here for few year now and never lead to massive leakage but I would like to fix it.
I am wondering if this is coming from oil pump tube or from cam shaft seal or somewhere underneath timing belt.

Here you have some picture.
Any help is more than welcome.

Stéphane

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Engine oil leak