Em nenhum lugar vs. em lugar nenhum vs. nenhures
In Portuguese, expressing the concept of "nowhere" can be done using phrases that differ primarily in word order and formality. While em nenhum lugar and em lugar nenhum are widely used in daily conversation, nenhures is a single word reserved for literary or archaic contexts.
Em nenhum lugar
A2This is the most grammatically standard way to say "nowhere" or "not anywhere". It follows the strict order of preposition (em) + quantifier (nenhum) + noun (lugar). It is used in both formal and informal registers and usually requires a double negative structure (using não before the verb).
Eu não encontrei minhas chaves em nenhum lugar.
(I didn't find my keys anywhere.)
Não vejo essa opção em nenhum lugar do menu.
(I don't see this option anywhere on the menu.)
Ela disse que não vai a nenhum lugar hoje à noite.
(She said she isn't going anywhere tonight.)
Em lugar nenhum
A2This phrase has the exact same meaning as the previous one, but the quantifier (nenhum) is placed after the noun (lugar). This inversion is extremely common in spoken Portuguese, especially in Brazil, and often adds a slight emphasis to the negation. It is interchangeable with em nenhum lugar in almost all contexts.
Esse caminho não vai dar em lugar nenhum.
(This path won't lead anywhere.)
Procurei por toda a casa, mas o gato não está em lugar nenhum.
(I searched the whole house, but the cat isn't anywhere.)
Não há paz em lugar nenhum nesta cidade barulhenta.
(There is no peace anywhere in this noisy city.)
Nenhures
C2This is a single word derived from Latin that means "nowhere". It is archaic, literary, or highly formal. You will almost never hear this in modern casual hearing, as it sounds poetic or old-fashioned, similar to using distinct words like "yonder" in English.
O navio partiu rumo a nenhures.
(The ship departed towards nowhere.)
Ele parecia vir de nenhures e ir para lugar algum.
(He seemed to come from nowhere and go to no place.)
A resposta reside em nenhures, perdida no tempo.
(The answer lies nowhere, lost in time.)
Summary
To summarize, use em nenhum lugar or em lugar nenhum for all standard communication; they are synonyms, with the latter being very popular in spoken Brazilian Portuguese. Avoid using nenhures unless you are writing poetry or trying to sound intentionally old-fashioned.