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Prepositions with nouns

At, of, to, above or by sea?

Different prepositions with sea express travel, location, direction, or relation.

Quick answer

The most common fixed phrases are by sea and at sea

Use by sea for transport, at sea for being on the ocean or confused, and to sea for movement toward the ocean. Of sea is uncommon except in larger noun phrases.

The goods were shipped by sea.
The sailors spent months at sea.
The river flows to sea.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
by sea

Method of transport

Use by sea for travel or shipping across water.

We travelled by sea from Greece to Italy.
2
at sea

On the ocean

Use at sea for location on the water or uncertainty.

The crew remained at sea for weeks.
3
to sea

Movement toward the ocean

Use to sea with movement or flow.

The fishermen returned to sea at dawn.
4
above sea level

Height measurement

Use above sea level for altitude.

The town is 800 metres above sea level.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
by sea
The cargo arrived by sea.
Transport across water.
at sea
She felt at sea in the new job.
On the ocean or confused.
to sea
The ship sailed to sea.
Toward the open sea.
of sea
The phrase of sea is uncommon by itself.
Usually replaced by sea-related or of the sea.
above sea level
The village lies above sea level.
Higher than the average sea surface.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using by sea for location

By sea describes transport, not location.

✕ The sailors were by sea for months. ✓ The sailors were at sea for months.

Using of sea alone

Use of the sea or another structure.

✕ The smell of sea filled the air. ✓ The smell of the sea filled the air.

Quick practice

Choose the expression that matches the intended meaning.

1. The packages were sent ___ sea.
2. After weeks ___ sea, they returned home.
3. The river eventually flows ___ sea.

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Frequently asked questions

What does at sea mean figuratively?

It can mean confused or uncertain.

Is by sea similar to by air?

Yes. Both describe methods of transport.

Can I say above sea?

The usual full expression is above sea level.

"across border" or "of border"? as, in, of, to or for part? at, from, of, to or for home? at, of, after, on or for launch? At, of, in, from or with bay? at, of, in, to, from, airport at, of, to, for or in conference? at, of, to, in or for university? at, of, without, for or on fault? "at rest" or "of rest"? "at risk" or "of risk"?

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