المحمية الطبيعية هنا.

In Modern Standard Arabic, the verb to be is usually not written or spoken in the present tense.

So:

• المحمية الطبيعية هنا literally looks like:
• the natural reserve here

But it means:

• The nature reserve is here.

This is called a nominal sentence in Arabic. In the present tense, Arabic often just puts the subject and the predicate next to each other.

If you wanted a past-tense version, then Arabic would use a verb, for example:

• كانت المحمية الطبيعية هنا = The nature reserve was here.

المحمية comes from the root ح م ى, which has the idea of protecting.

So محمية literally means something like:

• protected
• protected area
• reserve

In real usage, المحمية often means nature reserve or protected area, especially when followed by الطبيعية.

So:

• المحمية الطبيعية = the nature reserve
• more literally: the natural protected area

Arabic often expresses this idea with a noun + adjective structure.

Here:

• المحمية = the reserve / protected area
• الطبيعية = natural

So the phrase is literally:

• the reserve natural which in natural English becomes:
• the natural reserve or more idiomatically:
• the nature reserve

This is normal in Arabic: the adjective comes after the noun.

Because in Arabic, adjectives usually come after the noun they describe.

So:

• المحمية = the reserve
• الطبيعية = natural

Together:

• المحمية الطبيعية = the natural reserve

This is the opposite of normal English order, where adjectives usually come first.

Compare:

• English: natural reserve
• Arabic: reserve natural

Because Arabic adjectives must match the nouns they describe.

Since المحمية is definite (the reserve), the adjective must also be definite:

• المحمية = the reserve
• الطبيعية = the natural

So:

• المحمية الطبيعية = the natural reserve

If the noun were indefinite, the adjective would also be indefinite:

• محمية طبيعية = a natural reserve

This is a very important rule in Arabic:
noun and adjective agree in definiteness.

Because it must agree with المحمية, which is feminine.

You can see the feminine ending ة on both words:

• محمية
• طبيعية

In Arabic, adjectives usually agree with the noun in:

• gender
• number
• definiteness
• and, in fully vocalized Arabic, case

So الطبيعية is feminine because المحمية is feminine.

It is feminine mainly because the word itself is grammatically feminine. The ending ة is a strong clue.

Many Arabic nouns are grammatically feminine even when they refer to things, places, or abstract ideas.

So here, you should think:

• محمية is a feminine noun
• therefore the adjective must also be feminine: طبيعية

Grammatical gender in Arabic does not always match natural gender.

Because ط is a sun letter.

When الـ comes before a sun letter, the l sound of al- is not pronounced. Instead, the following consonant is doubled.

So:

• written: الطبيعية
• pronounced: aṭ-ṭabīʿiyya

You still write الـ, but in pronunciation the l disappears.

This is the same kind of thing you hear in words like:

• الشمس pronounced ash-shams
• الطالب pronounced aṭ-ṭālib

A common pronunciation is:

• al-maḥmiyya

A few helpful notes:

• ح is a deeper, breathier h sound than English h
• يّ indicates a doubled y sound
• the final ة is usually pronounced like -a when pausing

So in normal citation-style pronunciation:

• المحمية → al-maḥmiyya

In very formal grammar with full case endings, it could be al-maḥmiyyatu, but in ordinary pronunciation the ending is usually not fully pronounced.

Because Arabic often puts the subject first and the predicate after it in simple nominal sentences.

So:

• المحمية الطبيعية = the nature reserve
• هنا = here

Together:

• المحمية الطبيعية هنا = The nature reserve is here.

This word order is very natural.

Arabic can sometimes move هنا earlier for emphasis, for example:

• هنا المحمية الطبيعية

But the basic sentence you have is a very normal way to say it.

هنا means here, and it functions as an adverb of place.

In traditional Arabic grammar, it is often treated as a ظرف مكان (adverbial expression of place).

In this sentence, it is the predicate:

• المحمية الطبيعية = subject
• هنا = predicate

So it tells you where the nature reserve is.

Yes. Without الـ, it becomes indefinite:

• محمية طبيعية هنا = A nature reserve is here

With الـ, the sentence means:

• المحمية الطبيعية هنا = The nature reserve is here

So the presence or absence of الـ changes whether the meaning is:

• the ... or
• a ...

In fully vocalized formal Arabic, it would typically be:

• الْمَحْمِيَّةُ الطَّبِيعِيَّةُ هُنَا

More explicitly in transliteration:

• al-maḥmiyyatu aṭ-ṭabīʿiyyatu hunā

Why -u on the first two words?

• المحمية is the subject of the nominal sentence, so it is nominative
• الطبيعية is an adjective describing it, so it matches its case

As for هنا, it is an indeclinable word, so it does not take a changing case ending in the same way.

In everyday reading and speech, learners usually see or say:

• المحمية الطبيعية هنا

without worrying too much about the final vowels at first.