Splutí začíná u nástupního místa.

Splutí is a verbal noun. It comes from the verb splout / splout se in the sense of going down a river by boat, raft, canoe, etc. In this sentence, it means something like the river descent, the boat trip, or the float.

Czech often uses verbal nouns where English might use:

• a normal noun: the trip
• or a gerund-like expression: floating / going down the river

So Splutí začíná... literally means The descent begins... or The float starts...

Because the subject is splutí, and splutí is grammatically singular.

So:

• Splutí = the river descent / the float
• začíná = begins / starts

Even though the English idea might feel like an event or activity, in Czech it is being treated as one single thing, so the verb is singular.

It is in the nominative singular, because it is the subject of the sentence.

You can think of the structure like this:

• Splutí = subject
• začíná = verb
• u nástupního místa = location phrase

So the basic pattern is: [Subject] + [verb] + [place]

U usually means at, by, or near.

In this sentence, u nástupního místa means:

• at the boarding point
• by the starting/launch point
• near the embarkation place

So u does not mean movement to a place. It describes location at/near a place.

Because the preposition u requires the genitive case.

So:

• nominative: nástupní místo
• genitive: nástupního místa

That is why both words change:

• nástupní → nástupního
• místo → místa

This is a very important Czech pattern: after many prepositions, the noun phrase has to go into a specific case.

Literally, it means boarding place or embarkation point.

It comes from:

• nástup = boarding, getting on, embarking
• místo = place, spot

In the context of a river trip, it means the place where participants start, get into the boat, or set off.

Depending on context, English translations might include:

• launch point
• starting point
• boarding point
• embarkation point

Because nástupní is an adjective describing místo, and adjectives must agree with the noun in:

• gender
• number
• case

Here, místo is:

• neuter
• singular
• genitive (because of u)

So the adjective must also be neuter singular genitive:

• nominative: nástupní místo
• genitive: nástupního místa

Czech has no articles like a/an or the.

So u nástupního místa could mean:

• at a boarding point
• at the boarding point

Which one sounds right depends on context. In many real situations, English would naturally use the if the place is already known from the situation, but Czech simply does not mark that difference with an article.

Yes. Czech word order is quite flexible, although the neutral order here is very natural:

Splutí začíná u nástupního místa.

You could also see variants such as:

• U nástupního místa začíná splutí.

That version puts more focus on where it starts.

Even though word order can change, the cases help show the grammatical roles, so the meaning usually stays clear.

The beginning spl- can feel a little difficult for English speakers because Czech allows consonant clusters more freely.

A rough pronunciation guide:

• splutí ≈ SPLoo-tee
• stress is on the first syllable: SPLU-tí

A few details:

• u is like oo in food
• í is a long ee sound
• the t before í is usually softer than an English t

So it sounds roughly like SPLoo-tee, with the first syllable stressed.

Začíná comes from začínat, which is imperfective.

That matters because Czech often uses the imperfective verb when simply stating that something begins/is beginning/starts as a general fact or scheduled event.

The perfective partner is začít:

• začínat = to begin, to be beginning, to start repeatedly or in progress
• začít = to begin/start as a completed event

In a sentence like this, začíná is the normal choice for a neutral statement such as The descent starts at...

It could be understood in more than one way, depending on context.

Splutí začíná u nástupního místa. can mean:

• a general fact: the route starts at the boarding point
• a description in instructions or signage
• a scheduled event
• in some contexts, even it is starting there

Czech present tense often covers meanings that English may split into:

• starts
• is starting
• does start

So the exact interpretation comes from the situation, not just the verb form.

It is understandable and correct, but it is somewhat more formal or specialized than some everyday alternatives.

In tourist, outdoor, or sports contexts, it is perfectly natural. You may also hear related expressions such as:

• splavování řeky = river floating / descending a river
• vodácký výlet = boating trip / paddling trip
• sjezd řeky = river descent

So splutí is a useful word, especially in river-tourism contexts, even if it is not one of the most basic beginner words.