Wasaṭ al-ḥalq is the middle region of the throat, from which ع and ح are pronounced.
ع: is a distinct middle-throat consonant, as in عَلِمَ.
ح: is characterized by a distinct breath-friction sound from the same broad region, as in حَمْد.
Do not replace ayn with hamzah or an open vowel, and do not reduce ḥa to ه. Since learners often confuse these sounds, direct listening and correction by a qualified reciter are especially important.