More knowledgeable than a sand dune أدل من دعيميص الرمل

This is the name of a man who was a skilled and cunning guide. He is used as a proverb, and it is said: "He is a master of this matter," meaning he is knowledgeable about it.
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The proverb "More knowledgeable than a sand dune" is used to describe someone who is extremely knowledgeable about a matter, an expert in its intricacies and hidden aspects, and who neither gets lost nor is ignorant of it.
The origin of the proverb is that a sand dune was a skilled and experienced guide (i.e., adept at navigating paths and deserts), and its name became a metaphor for knowledge and expertise. Hence the saying, "He is the dune of this matter," meaning he knows its secrets and details.
The closest English proverbs and expressions are:
He knows it like the back of his hand.
An old hand at it.
He is an expert in it.
He knows every inch of it.
A walking encyclopedia.
An expert guide.
The best equivalent to the Arabic proverb is:
"He knows it like the back of his hand."
Meaning: He knows the matter perfectly and precisely; no detail is hidden from him.
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هو اسم رجل كان دليلا خريتا داهيا . يضرب به المثل فيقال : هو دعيميص هذا الأمر أي عالم به