Свисток лежит на спасательном одеяле.

Russian often uses a verb of position when describing where something is.

• лежать / лежит = to lie, to be lying
• стоять / стоит = to stand, to be standing
• висеть / висит = to hang, to be hanging

A whistle on a blanket is understood as resting on a surface, so лежит is the natural choice.

In English, we often just say is on, but Russian is more likely to say how the object is positioned.

Свисток is in the nominative singular.

It is the subject of the sentence — the thing that is doing the action of лежит.

Base form:

• свисток = whistle

Because it is masculine and ends in a consonant, the nominative singular form is just свисток.

Because на is being used to show location: the whistle is on the blanket.

With на, Russian usually works like this:

• на + prepositional = location, on
• на + accusative = motion onto something

So:

• Свисток лежит на спасательном одеяле. = The whistle is on the emergency blanket.
• Положи свисток на спасательное одеяло. = Put the whistle onto the emergency blanket.

Here there is no movement, only location, so the prepositional is used.

The basic phrase is:

• спасательное одеяло = emergency blanket

When it follows на in the sense of location, it changes to the prepositional singular:

• на спасательном одеяле

Here is what changed:

• спасательное → спасательном
• одеяло → одеяле

The adjective must agree with the noun in gender, number, and case.

Since одеяло is:

• neuter
• singular
• prepositional

the adjective also has to be:

• neuter
• singular
• prepositional

Yes, одеяло is a neuter noun.

Its dictionary form ends in -о, which is a common sign of neuter gender.

The adjective ending -ом may look surprising, but it is correct. In the prepositional singular, many hard-stem adjectives use:

• -ом for masculine and neuter

So:

• спасательное одеяло = nominative
• на спасательном одеяле = prepositional

That is normal adjective declension.

It means an emergency blanket or rescue blanket — the thin reflective blanket used in first aid, survival, or rescue situations.

The adjective comes from спасательный, which means something like:

• rescue
• lifesaving
• emergency-related

So спасательное одеяло is a natural phrase for that kind of blanket.

Because the whistle is on the surface of the blanket, not inside it.

• на = on
• в = in, inside

So if something is resting on top of a blanket, на is the right preposition.

Yes. Russian word order is flexible.

The sentence:

• Свисток лежит на спасательном одеяле.

is a normal, neutral way to say it.

But you could also say:

• На спасательном одеяле лежит свисток.

That version puts more emphasis on where the whistle is.

So the basic meaning stays the same, but the focus can shift depending on word order.

Russian does not have articles like English a/an and the.

So свисток can mean:

• a whistle
• the whistle

and спасательное одеяло can mean:

• an emergency blanket
• the emergency blanket

Context tells you which meaning is intended.

That is completely normal in Russian.

A helpful stressed version is:

• Свисто́к лежи́т на спаса́тельном одея́ле.

Approximate pronunciation:

• svistaK lyeZHEET na spaSAtyel'nam adyiYAlye

A few notes:

• ё is not written here, so одеяле is still pronounced with the stress on я: одея́ле
• лежит has stress on the second syllable: лежи́т
• свисток has stress on the last syllable: свисто́к